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IAEA1361 SUNF.

SUNF, Simplified UNF Code, Fast Neutron Calculation by Unified Hauser-Feshbach Theory

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1. NAME OR DESIGNATION OF PROGRAM:  SUNF.
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2. COMPUTERS
To submit a request, click below on the link of the version you wish to order. Only liaison officers are authorised to submit online requests. Rules for requesters are available here.

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Machines used:

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3. DESCRIPTION OF PROGRAM OR FUNCTION

  The SUNF code is the simplified version of UNF code and is based on the unified Hauser-Feshbach and exciton model. SUNF code has been developed for calculations of fast neutron data for structural materials with neutron energies below 20 Mev. Besides elastic scattering channel, the code may handle decay sequence up to (n,3n) reaction, including 14 reaction channels. The energy spectra can be obtained and the output form is in the ENDF/B-6 format, but in file 5 form. For the ENDF-B-6 output, the incident energies are divided into two types: only cross section calculation; and those including neutron energy spectra.
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4. METHODS

Gaussian integration is used for all numerical integration.
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5. RESTRICTIONS ON THE COMPLEXITY OF THE PROBLEM

The incident energies of neutrons are from 1KeV to 20 MeV. There are two parameters in this code: incident neutron energies number "NEL"; and the number of discrete levels of residual nuclei for the first particle emissions "NLV". The users can set the values of NEL and NLV according to the storage size of the computer used. The number of discrete levels of residual nuclei for the multi-particle emissions is not greater than 20.
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6. TYPICAL RUNNING TIME

For the calculation of whole set fast neutron data of 103-Rh En=1 keV to 20 MeV for 40 neutron incident energies, the typical running time is about 8 minutes on a PC-586 (120).
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7. UNUSUAL FEATURES
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8. RELATED OR AUXILIARY PROGRAMS

A code for automatic adjustment parameters of optical model is needed to determine the optimal optical potential parameters as the input of this  code. If the direct scattering data and the direct reaction data are available from other codes, one can input the data so that the results will include the direct process effects.
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9. STATUS

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10. REFERENCES

- Zhang Jingshang:
  A semi-classical theory of multi-step nuclear reaction processes.
  To be published in "Proceedings of the Conference of Fast Neutron
  Physics, Beijing, P.R. China, 1991."
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11. HARDWARE REQUIREMENTS
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12. PROGRAMMING LANGUAGE(S) USED

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13. SOFTWARE REQUIREMENTS:  DOS 6.0, OpenVMS 7.1
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14. OTHER PROGRAMMING OR OPERATING INFORMATION OR RESTRICTIONS
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15. NAME AND ESTABLISHMENT OF AUTHORS

                Zhang Jingshang
                China Nuclear Data Center
                Chinese Institute of Atomic Energy
                P.O. Box 275 (41)
                Beijing, P. R. China
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16. MATERIAL AVAILABLE
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17. CATEGORIES

Keywords: ENDF/B, Hauser-Feshbach theory, fast neutrons.